The composite materials are present in nature since the prehistoric era. Applications of fiber-based composite materials are increasing day by day in our society to overcome the raised environmental and economic concerns. Hence, waste fiber can be utilized as the best resource to develop composites.

The present study deals with the impact of hybridization on the mechanical, thermal, and water absorption behavior of hair and coir fiber-based hybrid composites. The compression molding technique was used to develop the hybrid composites with fixed fiber content (15 wt.%) and was also varied the relative weight percentage of hair and coir fibers [(100% HF), (75% HF/25% CF), (50% HF/50% CF), (25% HF/75% CF) and (100% CF)] in reinforcing phase with HDPE composites S₁, S₂, S₃, S₄, and S₅, respectively. The composite S₂ was achieved superior mechanical attributes as compared to other hybrid/non-hybrid composites. The composite S₂ was improved the tensile strength 5% and 35.2% more in comparison to composites S₁ and S₅, respectively. The thermal behavior (TGA, DTG, and DTA) was also influenced by the blending ratio of fibers of composites. The 5% and 50% weight losses of composite S₂ were observed at higher temperature 343.8°C and 465.8°C as compare to other composites, which showed the thermal stability of composites S₂. SEM analysis was used to investigate the strength of the fiber-matrix interface, which was shown a significant connection between mechanical and thermal behaviors. The crystallinity of hybrid and non-hybrid composites was examined by using the X-ray diffraction (XRD) analyzer and composite S₂ was achieved 326 × 10⁻⁹ m crystal size at 21.053° peak position with wavelength 1.5406 × 10⁻¹⁰ m for Cu. The water absorption test was used to examine the moisture resistivity of composite materials, which was helpful to increase the applications of materials in humid areas.

复合材料自史前时代就存在于自然界中。纤维基复合材料在我们社会中的应用日益增加，以克服日益严重的环境和经济问题。因此，废纤维可以作为开发复合材料的最佳资源。

本研究涉及杂化对基于毛发和椰壳纤维的杂化复合材料的机械、热和吸水行为的影响。压缩成型技术用于开发具有固定纤维含量 (15 wt.%) 的混合复合材料，并且还改变了头发和椰壳纤维的相对重量百分比 [(100% HF), (75% HF/25% CF) ，（50％HF / 50％CF），（25％HF / 75％CF）和（100％CF）]与HDPE增强相复合小号₁，S ₂，S ₃，S ₄，和S ₅分别. 与其他混合/非混合复合材料相比，复合材料 S ₂获得了优异的机械属性。复合 S ₂与复合材料 S ₁和 S ₅相比，拉伸强度分别提高了 5% 和 35.2% 。热性能（TGA、DTG 和 DTA）也受复合材料纤维混合比的影响。与其他复合材料相比，在 343.8°C 和 465.8°C 的较高温度下观察到复合材料 S ₂的 5% 和 50% 重量损失，这表明复合材料 S ₂的热稳定性。SEM 分析用于研究纤维-基质界面的强度，这表明机械和热行为之间存在显着联系。使用 X 射线衍射 (XRD) 分析仪检查杂化和非杂化复合材料的结晶度，复合材料 S ₂达到 326 × 10^-9 m 晶体尺寸在 21.053° 峰值位置，Cu 的波长为 1.5406 × 10 ^-10 m。吸水试验用于检测复合材料的耐湿性，有助于提高材料在潮湿地区的应用。